PowerShell Switch

Example of a basic PowerShell Switch

$SwitchName = <Get-...> #Get-Command or something similar
 
Switch ($SwitchName) {
    "Name 1" {$SwitchNumber = 1; break} #Answer to the Get-Command = "Name 1"
    "Name 2" {$SwitchNumber = 2; break} #Answer to the Get-Command = "Name 2"
}
 
Switch ($SwitchNumber) {
    1 {Write-Host "Name 1 is selected, do someting"}
    2 {Write-Host "Name 2 is selected, do someting"}
}

Example of a PowerShell Switch to configure RSS-Settings

This example is for 4 variants of Hyper-V Nodes (RSS-Settings)

• Chelsio Network-Card in a Node with 14 physical Cores per CPU
• Chelsio Network-Card in a Node with 8 physical Cores per CPU
• Mellanox Network-Card in a Node with 14 physical Cores per CPU
• Mellanox Network-Card in a Node with 8 physical Cores per CPU

With the switch we distinguish between Chelsio and Mellanox. After that we check the number of cores per CPU.

#Configure Core Mapping
$CPUProperty = "NumberOfCores","NumberOfLogicalProcessors"
$StandardNumberOfCores = 14
$HighClockNumberOfCores = 8
$NumberOfCores = (Get-WmiObject -class win32_processor -Property $CPUProperty).NumberOfCores[0]
 
#Find Network Hardwarde Vendor
$NetworkVendorName = (Get-WmiObject -class win32_networkAdapter -Property "Name").name
 
 
# Set Vendor Number
# 1 = Chelsio
# 2 = Mellanox HP 546FLR
 
switch ($NetworkVendorName)
{
    "Chelsio Network Adapter" {$NetworkVendorNumber = 1 ; break}
    "HP Ethernet 10G 2-port 546FLR-SFP+ Adapter"{$NetworkVendorNumber = 2 ; break}
}
 
#------------------------------------------------------------------------------------------------
 
 
switch ($NetworkVendorNumber) {
 
 1 {       #RSS-Settings für Chelsio / Stand 07.05.2018
           Enable-NetAdapterRSS -Name NIC01
           Enable-NetAdapterRSS -Name NIC02
 
           #Standard Hyper-V Nodes für Chelsio
           If ($NumberOfCores -eq $StandardNumberOfCores) {
                Write-Verbose "Setze RSS für Standard Hyper-V Nodes für Chelsio" 
                Set-NetAdapterRss -Name NIC01 -BaseProcessorGroup 0 -BaseProcessorNumber 2 -MaxProcessors 8 -MaxProcessorNumber 26 -Profile Closest -NumaNode 0
                Set-NetAdapterRss -Name NIC02 -BaseProcessorGroup 0 -BaseProcessorNumber 30 -MaxProcessors 8 -MaxProcessorNumber 54 -Profile Closest -NumaNode 1
           } 
 
           #High-clock Hyper-V Nodes für Chelsio
           ElseIf ($NumberOfCores -eq $HighClockNumberOfCores) { 
                Write-Verbose "Setze RSS für High-clock Hyper-V Nodes für Chelsio" 
                Set-NetAdapterRss -Name NIC01 -BaseProcessorGroup 0 -BaseProcessorNumber 2 -MaxProcessors 7 -MaxProcessorNumber 14 -Profile Closest -NumaNode 0
                Set-NetAdapterRss -Name NIC02 -BaseProcessorGroup 0 -BaseProcessorNumber 18 -MaxProcessors 7 -MaxProcessorNumber 30 -Profile Closest -NumaNode 1
           } 
            break          
    }                  
 
 
 2 {       #RSS-Settings für Mellanox HP / Stand 07.05.2018
           Enable-NetAdapterVmq -Name NIC01
           Enable-NetAdapterVmq -Name NIC02          
 
           #Standard Hyper-V Nodes für HP Mellanox
           If ($NumberOfCores -eq $StandardNumberOfCores) { 
                Write-Verbose "Setze RSS für Standard Hyper-V Nodes für HP Mellanox" 
                Set-NetAdapterRss -Name NIC01 -BaseProcessorGroup 0 -BaseProcessorNumber 2 -MaxProcessors 6 -MaxProcessorNumber 12 -Profile Closest -NumaNode 0
                Set-NetAdapterRss -Name NIC02 -BaseProcessorGroup 0 -BaseProcessorNumber 14 -MaxProcessors 6 -MaxProcessorNumber 24 -Profile Closest -NumaNode 0
           }
 
           #High-clock Hyper-V Nodes für Mellanox HP / Stand 07.05.2018
           ElseIf ($NumberOfCores -eq $HighClockNumberOfCores) { 
                 Write-Verbose "Setze RSS für High-clock Hyper-V Nodes für Mellanox HP" 
                Set-NetAdapterRss -Name NIC01 -BaseProcessorGroup 0 -BaseProcessorNumber 2 -MaxProcessors 3 -MaxProcessorNumber 6 -Profile Closest -NumaNode 0
                Set-NetAdapterRss -Name NIC02 -BaseProcessorGroup 0 -BaseProcessorNumber 8 -MaxProcessors 3 -MaxProcessorNumber 12 -Profile Closest -NumaNode 0
           }
            break
    }
}